NASA NTRS · 19890033000
Neutral atomic carbon in dense molecular clouds
Abstract
The 370 micron 3P2-3P1 fine-structure line of neutral carbon was detected in seven sources: OMC 1, NGC 2024, S140, W3, DR 21, M17, and W51. Simultaneous analysis of J = 2-1 data and available observations of the J = 1-0 line make it possible to deduce optical depths and excitation temperatures for these lines. These data indicate that both C I lines are likely to be optically thin, and that the ratio of C I to CO column densities in these clouds is typically about 0.1.
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Zmuidzinas, J., Betz, A. L., Boreiko, R. T., Goldhaber, D. M.. 1988-12-15. Neutral atomic carbon in dense molecular clouds. https://ntrs.nasa.gov/citations/19890033000
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